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Right click feature windows explorer

Frank Aret

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I have recently upgraded to NitroPro12. Since then I am missing the right click feature "combine pdf"  from the explorer. Also missing right click features for direct converting serveral formats into pdf. I have read solutions on other forums, but those concerned  Arcobat Adobe. For NitroPro 12 I have not seen any solution. Can anybody help me out on this one ?

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Thank you Steven, your tip helped. Missing right click features are back and Nitro even seems to be faster now aswell. Thanks again for help.

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  • Official Nitronaut
Allain Umailin

Hello @CCross,

Thank you for reaching out to us through our Community Forums!

Have you tried repairing your Nitro Pro by referring to the link @Mrfra62 has shared? If that didn't help, kindly re-register the DLL file using the following Administrator command (Admin CMD): 

For 32-bit:
regsvr32 -u "C:\Program Files (x86)\Nitro\Pro\ X\NitroPDFPreviewHandler.dll" 
regsvr32 "C:\Program Files (x86)\Nitro\Pro\ X\NitroPDFPreviewHandler.dll" 

For 64-bit:
regsvr32 -u "C:\Program Files\Nitro\Pro\ X\NitroPDFPreviewHandler.dll" 
regsvr32 "C:\Program Files\Nitro\Pro\ X\NitroPDFPreviewHandler.dll"
X = the version number of Nitro Pro the user is working with. 

Thanks for choosing Nitro Pro and I hope this helps!

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  • 4 years later...
Minute Maid

Hello @Allain Umailin

I know this may be an old thread but I'm looking for a resolution for this one, I have tried running those commands you gave and ran CMD as administrator but still the same issue persists. Or do I need to logout, reboot the computer for it to work? Any additional assistance would be really helpful, 


Here's the screenshot of what I'm having right now, 



Nitro Version: 12

Plug-ins : All Updated

Printer Nitro Driver: Re-installed


Thank you!

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  • Official Nitronaut
Allain Umailin

Hello @Minute Maid,

Thank you for reaching out to us through our Community Forums!

Could you please provide a screenshot of your 'About Nitro Pro' window under the Help tab? This window should show the exact build of the program (format is 12.XX.X.XXX, e.g. The same information is available by going to Control Panel > Programs and Features.

Thank you very much in advance and I look forward to hearing back from you.


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  • Official Nitronaut
Allain Umailin

Hello @Minute Maid,

Thank you for this information and let us try some troubleshooting by referring to these steps:

1. Download and run our Clean Up utility to uninstall your current Nitro Pro and reboot your machine:



NOTE: This clean-up tool will erase any existing signature files within Nitro so please save them to another location before using the clean-up tool in order to keep them. Please see this link for backing up custom stamps/signatures: https://kb.gonitro.com/knowledgebase#/search/stamps/000004509

2. After rebooting, download and install the latest version of Visual Studio (vc_redist.x64.exe & vc_redist.x86.exe) then reboot again your machine. Visual Studio 2015, 2017, 2019, and 2022 all share the same redistributable files:


3. Clear all your Downloads folder or delete all downloaded Nitro installers. This step is important because we noticed that if you are saving all the installers and you download them in the same folder (like the downloads folder), the EXE can pick up any MSI installer in that folder and you may pick-up one of the older builds instead of the newly downloaded package.

4. Download and install Nitro Pro using these installers:

x32 http://install.nitropdf.com/professional_12169574/en/retail/nitro_pro12_ba_x86.msi
x64 http://install.nitropdf.com/professional_12169574/en/retail/nitro_pro12_ba_x64.msi

To know if you have 32-bit or 64-bit Windows system, please refer to this article:

Important: If you are using Chrome or any of the Chromium-based browsers (e.g., Vivaldi, etc.) and you are unable to access the above installer links, you're more than likely experiencing the results of a new security feature that was silently pushed out to the browsers, which blocks .exe/.msi/etc downloads without any visible error or prompt on the browser's frontend user space. In order to bypass this, please try these steps:

a. Right-click the link you're trying to download, and select "Save link as..."
b. Choose your save location and select "Save"
c. On the bottom edge of your browser window, the Downloads bar should now appear and the file will show up with a red error icon, attempting to block the download. Press the caret button and select "Keep"

5. After installation, you can activate it by opening Nitro PDF Pro, clicking on the Help tab > About Nitro Pro > Activate by entering your serial number.

6. Turning off User Account Control (UAC) for Nitro Pro. Here are two methods that you can follow:

   a. Right-click the Nitro shortcut > Properties > Compatibility > Turn off any settings there.

   i. Right-click > Troubleshoot Compatibility > Troubleshoot Program
   ii. Check "The program requires additional permissions" > Next > Test the program...
   iii. Wait for the program to launch > Next > Yes, save these settings for this program > Close

Thank you very much in advance and I am looking forward to hearing back from you.


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Karen Collins

Hi, the original link shared no longer works (http://kb.gonitro.com/knowledgebase#/answers/Nitro Pro/000001641 - does not load), and I am having the same issue on a brand new machine, with a fresh install of Nitro Pro. - The only right click option in windows explorer that exists is  to Open nitro or to Edit with Nitro Pro. On my other machine I had combine with and convert with. Having to go into Nitro to combine is not only annoying, but it defaults to a buried folder, instead of remembering where you just were and taking you back there.


Edited by Karen Collins
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